package com.mycode.chapter02.server;

import com.mycode.chapter02.common.Constants;

import javax.servlet.ServletOutputStream;
import javax.servlet.ServletResponse;
import java.io.*;
import java.nio.charset.StandardCharsets;
import java.util.Locale;

public class Response implements ServletResponse {

    private static final int BUFFER_SIZE = 1024;
    private OutputStream outputStream;
    private Request request;
    private PrintWriter printWriter;

    public Response(OutputStream outputStream) {
        this.outputStream = outputStream;
    }

    public void setRequest(Request request) {
        this.request = request;
    }

    public void sendStaticResource() throws IOException {
        byte[] bytes = new byte[BUFFER_SIZE];
        FileInputStream fis = null;
        try {
            File file = new File(Constants.WEB_ROOT, request.getUri());
            if (file.exists() && file.isFile()) {
                fis = new FileInputStream(file);
                int count = 0;
                while (count == 0) {
                    count = fis.available();
                }
                String successMessage = "HTTP/1.1 200 OK \n" +
                        "Content-type:text/html \n" +
                        "Content-Length: " + count + " \n" +
                        "\r\n";

                outputStream.write(successMessage.getBytes(StandardCharsets.UTF_8));
                int ch = fis.read(bytes, 0, BUFFER_SIZE);
                while (ch!=-1) {
                    outputStream.write(bytes, 0, ch);
                    ch = fis.read(bytes, 0, BUFFER_SIZE);
                }
            }
            else {
                // file not found
                String errorMessage = "HTTP/1.1 404 File Not Found\r\n" +
                        "Content-Type: text/html\r\n" +
                        "Content-Length: 23\r\n" +
                        "\r\n" +
                        "<h1>File Not Found</h1>";
                outputStream.write(errorMessage.getBytes());
            }
        }
        catch (Exception e) {
            // thrown if cannot instantiate a File object
            System.out.println(e.toString() );
        }
        finally {
            if (fis!=null) {
                fis.close();
            }
        }
    }


    @Override
    public PrintWriter getWriter() throws IOException {
        printWriter = new PrintWriter(outputStream, true);
        System.out.println("create printWriter");
        return printWriter;
    }

    @Override
    public String getCharacterEncoding() {
        return null;
    }

    @Override
    public String getContentType() {
        return null;
    }

    @Override
    public ServletOutputStream getOutputStream() throws IOException {
        return null;
    }



    @Override
    public void setCharacterEncoding(String s) {

    }

    @Override
    public void setContentLength(int i) {

    }

    @Override
    public void setContentType(String s) {

    }

    @Override
    public void setBufferSize(int i) {

    }

    @Override
    public int getBufferSize() {
        return 0;
    }

    @Override
    public void flushBuffer() throws IOException {

    }

    @Override
    public void resetBuffer() {

    }

    @Override
    public boolean isCommitted() {
        return false;
    }

    @Override
    public void reset() {

    }

    @Override
    public void setLocale(Locale locale) {

    }

    @Override
    public Locale getLocale() {
        return null;
    }
}
